In this example, if we solve by the normal procedure, it will take lot of time and carry forwards efforts and there are more chances of mistakes by kids.
An easy of solving this problem would be by subtracting 1 from both the numbers. Subtracting 1 from both numbers would be easy.
Then the problem would look like this:
This does not involve any carry forwards and therefore easy to solve it. Subtracting any number from 9 is also easy. So, the same problem can be solved in less time and with less efforts with minimal chances of mistakes.